you should pick the right friends and if your like me your more selective dont pick someone way off your path your not gonna get along so why be friends you want to choose someone who you can tell anything to because you can trust them i have a best friend and thats what keeps us together is trust how do you no that he/she is the right choice?.... you test them and see if there like you you might like to go to the movies or tell screts then you should find someone who likes to go to the movies or who can tell you secrets haha make the right choice dont choose wrong

Similar to the other commenting folks. There's a bit more overlap in my FFd, Plurk, and Twitter groups. I started on Twitter with my students for a class, but my followers and such have changed drastically since the beginning of May. I don't think I tweet, plurk, or feed with any of my Fbook friends. I use other social media but w/o social interaction unless it comes through FFd.

on sites like twitter i always check who has friended me.
if they have say 29000 follows and 5 followers then i don't bother with them because they are just Muppet's, if its like 75/20 then yes i will follow them back. then there are the friends like you, who i friended on one site and then followed to another, i read your post on your blog, twitter and twine.
witch makes me sound more like a stalker than a friend :-)

For me, it depends on the network. My Facebook friends started out as real life friends and business associates or former colleagues, but I have also started adding social media gurus whom I "feel like" I know through their blogs and our interactions in that realm. On LinkedIn, it's mostly business colleagues whom I truly know in real life, but again I've started adding social media and PR pros whom I meet in the social media space. And as for Twitter, I just blogged about how I find people to follow there.

I have very different groups of friends on different networks: Facebook for the non-techies, Twitter for business and marketing, FriendFeed & del.icio.us for the hardcore geeks and Google Reader shared items for pictures of kittens.